http://www.jinstartech.com/

General Attributes:

SEL-351A very good price

The SEL-351A Protection System has built-in Ethernet and IEEE C37.118 synchrophasors, and is the economical solution for overcurrent protection. Easy-to-use feeder protection and innovative features like SEL’s Best Choice Ground Directional Element logic and SELogic control equations provide superior protection on utility and industrial power systems.

Comprehensive Protection—Provide primary or backup overcurrent protection on distribution feeders with sensitive phase, negative-sequence, residual, and neutral overcurrent protection elements.

Relay Access Convenience—Access basic relay information on a standard Ethernet network with the built-in web server. Securely update firmware and view relay status, settings, and other read-only information within a local network.

Protection Scheme Security—Set the bus overcurrent backup relay close to maximum bus load current levels by using load-encroachment logic to increase security in the system.

Fault Location—Estimate fault locations accurately and reduce total costs by eliminating the need for expensive communications channels, special instrument transformers, prefault information, or line crews to travel the distance of the line for visual fault inspection.

Optimized Asset Utilization—Validate system load flow and fault models by using instantaneous voltage angles from IEEE C37.118 synchrophasors. Use system-state measurements to increase stable system loading through reduced margin requirements.

• Integrate and automate substation equipment, even devices from multiple vendors, with IEC 61850 communications protocol.
• Provide primary or backup overcurrent protection on distribution systems with sensitive phase, negative-sequence, residual, and neutral overcurrent protection elements.
• Use wire-alike terminal configurations to take advantage of advancing technology, improving system protection performance and reducing total costs. This is the wire-alike upgrade for the popular SEL-251 Relay.
• Set the sensitive phase and ground directional elements for accurate and secure fault detection.
• Enhance sensitivity with two independent residual ground time-overcurrent elements.
• Measure and record in nonvolatile memory MW, MVAR, MWh, MVARh, PF, instantaneous and/or peak demand, eliminating the need for external meters.
• Provide multistep load-shedding schemes using under-/overfrequency elements.
• Use acSELerator QuickSet SEL-5030 Software to manage your relay settings.
• Use acSELerator Team SEL-5045 Software to automatically gather relay event reports on your PC and manage them with a database.
• Use SYNCHROWAVE Event Software

Features

Front  

Back

Overview

Protection

Innovative Directional Element Polarization
Provide directional stability during phase faults with the positive-sequence, voltage- polarized memory of the phase directional element. Best Choice Ground Directional Element system logic ensures secure ground directional element operation for all types of system grounding practices under varying system conditions.

Frequency Protection
Provide advanced load shedding with six levels of frequency elements and four-rate-of-change of frequency elements, plus under-/overvoltage protection.

Reclosing Control
Apply four-shot reclosing with sequence coordination, synchronism check, and voltage check.

Fault Locator
Calculate accurate distance-to-fault measurements using the impedance-based fault locator.

Second-Harmonic Blocking
Detect transformer energization with the second-harmonic blocking elements. The output from the harmonic detection elements blocks selected tripping elements until inrush conditions subside.

Options

• SELogic control equations
• Event reports
• Sequential Events Recorder (SER)
• Breaker wear monitor
• DNP3 Level 2 Outstation
• Modbus RTU and TCP
• High-accuracy metering
• Remote and local control switches
• Wye or delta voltage connection
• Synchrophasor measurements
• Fault locator
• Fast SER protocol
• acSELerator QuickSet Compatible
• Conformal coating
• SafeLock independent trip/close pushbuttons
• Dual copper, single or dual fiber-optic Ethernet ports
• Panel-mount or rack-mount hardware package
• EIA-485 serial port

351A#01

• 2U horizontal rack mount
• Feeder protection
• Three EIA-232 ports, a USB Standard-B port, an EIA-485 port, and dual 10/100BASE-T ports
• Eight outputs and six inputs (125 Vdc control input voltage)
• IEEE C37.118 synchrophasor measurement, DNP3 Outstation, Modbus TCP/RTU, Telnet, FTP, Simple Network Time Protocol (SNTP), and a built-in web server

Summary